(This might be little tricky to understand, for example, if you wrote a message in the chat room, everybody except you will get a refreshChatRoom event from server.

(‘ROOM_NAME’).emit(‘EVENT_NAME’,JSON_DATA) : It emits an event to the entire sockets in the room except for the socket which is communicating with now.

io.to(‘ROOM_NAME’).emit(‘EVENT_NAME’,JSON_DATA): It emits events to all sockets in the room.

socket.join(‘ROOM_NAME’): Joining room with the given name.

socket.emit(‘EVENT_NAME’, JSON_DATA): It emits an event to the client.

socket.on(‘EVENT_NAME’, CALLBACK): It listens to an event named ‘EVENT_NAME’ from a client.

All the logic of socket will be written in this callback function. Once the connection is successful, this will return socket with socket id.

io.on(‘connection’, function(socket)): Server waiting for connections from clients and we set the callback.

There are a few points that you need to give it a look, Since this article is covering how to use socket.io in android project, not about socket.io itself, I strongly recommend you to read the article below which explains socket.io well :) Creating an intermediate code from the source code intermediate code is interpreted by the virtual machine.

By using room and namespace, you can categorize sockets in the way you want.

You can use the template code and design and customize it to add your own features and monetization methods such as AdMob on in-app purchases.

A simple HTTP handshake takes place at the beginning of a Socket.IO connection. When building an Android app, it may be a good idea to start from an App Template, instead of starting from scratch.A template will give you a head start as it will allow you to start from an existing source code base.

(It is like we set an OnClickListener for our button in android.) Both server and client emitting an event and listening to event from each other. There are several things that you need to keep in mind which will help you to understand socket.io faster. Rather, in socket programming, we will only send the little data packets which are needed through web sockets. This Android full guide describes how to build an Android Openweathermap app that shows the current weather information. If you are trying t o make chatting application or multi-player game where it is important to make sure to maintain high-speed response time, it is not recommended to make HTTP calls since it is really slow. Socket.io is needed when we need real time in our application

You know the basics of android and node.js programming.

In case if you are not aware of creating an app in android studio check this article Android Hello World App. Create a new android application using android studio and give names as CameraExample.

This tutorial is written in Kotlin with Anko Library Following is the example of using an existing camera app in our android applications to capture the photos on button click.

Example android app source code